55726789 has 2 divisors, whose sum is σ = 55726790. Its totient is φ = 55726788.

The previous prime is 55726771. The next prime is 55726841. The reversal of 55726789 is 98762755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30305025 + 25421764 = 5505^2 + 5042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55726789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55726709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27863394 + 27863395.

It is an arithmetic number, because the mean of its divisors is an integer number (27863395).

Almost surely, 2^55726789 is an apocalyptic number.

It is an amenable number.

55726789 is a deficient number, since it is larger than the sum of its proper divisors (1).

55726789 is an equidigital number, since it uses as much as digits as its factorization.

55726789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 49.

The square root of 55726789 is about 7465.0377761938. The cubic root of 55726789 is about 381.9630388295.

The spelling of 55726789 in words is "fifty-five million, seven hundred twenty-six thousand, seven hundred eighty-nine".